The Portofino offers optional crash mitigation brakes, which use forward mounted sensors to warn the driver of a possible collision ahead. If the driver doesn’t react and the system determines a collision is imminent, it automatically applies the brakes at full-force in order to reduce the force of the crash or avoid it altogether. The McLaren GT doesn't offer collision warning or crash mitigation brakes.
The Portofino’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The McLaren GT doesn’t offer a lane departure warning system.
The Portofino offers an optional Surround View to allow the driver to see objects all around the vehicle on a screen. The McLaren GT only offers a rear monitor and front and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the sides.
The Portofino’s optional blind spot warning system uses sensors to alert the driver to objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The McLaren GT doesn’t offer a system to reveal objects in the driver’s blind spots.
To help make backing out of a parking space safer, the Portofino’s optional rear cross-path warning system uses sensors in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The McLaren GT doesn’t offer a cross-path warning system.
The Portofino has standard GPS Response System, which uses a global positioning satellite (GPS) receiver and a cellular system to send emergency personnel to the scene if any airbags deploy. The McLaren GT doesn’t offer a GPS response system, only a navigation computer with no live response for emergencies, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.
Both the Portofino and the McLaren GT have standard driver and passenger frontal airbags, four-wheel antilock brakes, traction control and electronic stability systems to prevent skidding.